Vehicle controls with keyboard scripts

This allows you to steer some of the vehicles using your keyboard instead of a mouse. This will not work on flying or hovering vehicles. The Chimera script will not work on a server unless the server has the sapp script. If people join the server without this script then they will probably warp a lot when driving vehicles. I haven't tested this in singleplayer but it might break some cutscenes where marines drive warthogs (I could fix this but can't be bothered).

There are a few settings you can edit on both server and client scripts but the client's settings will be overridden by the server settings when you join a server.

I would recommend not hosting a public server with this and just keep it for private gamenights or something.